Floor furnace with removable parts



5. P. CAMPBELL FLOOR FURNACE WITl-i REMOVABLE PARTS,

July 12, 1949.

3 Sheets-Sheet 1 Filed Dec/2e. 194s 7 w @Va///M/ IN VEN TOR.

ATTORNEYS r F I m T r r I P up w w I w 2 \H g u i q a E? b Filed Dec. 29, 1945 I :5 Sheet-ShetZ July 12, 1949. I I s. P. CAMPBELL 2,475,737

FLOOR FURNACE WITH REMOVABLE PARTS IN V EN TOR.

. ATTORNEYS y 12, 1949- s. P. CAMPBELL 2,475,737

FLOOR FURNACE WITH REMOVABLE 1"ARTS Filed Dec. 29, 1945 3 Sheets-Shee t 3 l I I 53 .6.

7/ 1 v 75 7? H Y b 88 I 524$ 6 25 .a.e .o.c4'l.oo ,7 /2 46 .13 23 INVENTQR. 70' l 5 2 5/2/r/eyP0//am[ampbe// f0 55 5 52 5/4 5 51 ATTORNEYS Patented Juiy 12, 1949 2,475,737 FLOOR FURNACE WITH REMOVABLE PARTS Shirley Pollard Campbell, Wichita, Kana, assignor to The Coleman Company, Inc., Wichita, Kans., a corporation of Kansas v Application December 29, 1945, Serial No. 637,995

13 Cla1ms.-- (01.126-116) This invention relates to floor furnaces and particularly to those requiring fuel burners, fuel control, and constant level waives and similar parts which must be serviced from time to time in order to maintain the furnace in eflicient operation. Furnaces of this character are installed in many homes without basements and due to the liability of flooding and other reasons, sufficient space cannot be provided below the floor to accommodate furnaces of the usual depth and provide room for servicing.

It is, therefore, the principal purpose of the present invention to provide a furnace assembly which requires less depth of space by partially locating the burner pot and constant level metering valve within the lower portion of the furnace casing.

Another object of the invention is to permit installation of the furnace in homes with baseinents so that they occupy less of the basement space.

Other objects of the invention are to provide a structure which permits servicing of the burner pot and constant level metering valve from above the floor when the furnace is installed in locations without basements and to provide for-removal of the burner pot and metering valve from below the floor when the furnace is installed in locations with basements.

Further objects of the invention are to provide for removal of the burner pot and metering valve without breaking the fuel connections when the" servicing is carried on within the basement; to provide a furnace construction having a lower cost of production through saving in material by reason of a furnace of shorter height; and to provide a furnace construction wherein the furnace parts are carried by the casing bottom, thereby eliminating the frame usually required to support such working parts.

In accomplishing these and other objects of the invention I have provided improved structure, the preferred forms of which are illustrated in-the accompanying drawings wherein:

Fig. 1 is a perspective view of a floor furnace showing the heater unit'assembly removed upwardly through the casing to a position above the floor for inspection and repair, parts of the casing being broken away to better illustrate the construction.

Fig. 2 is a perspective view of a floor furnace Fig. 5 is a vertical section through the furnace showing the heater unit assembly in position flanges 9 engaging the floor to support the casinstalled in a home having a basement and showing the burner and constant level control valve removed from the basement side for inspection and repair.

Fig. 3 is an enlarged section on the line 3-3 of Fig. 2 illustrating. removable support of the furnace bottom within the walls of the casing.

Fig. 4 is a fragmentary perspective view of the flue connection.

ing and to seat a removable fioor grill (not shown) that normally covers the open top of the casing. The lower edges of the casing walls terminate in downwardly and upwardly extending flanges l0 having the free edges thereof turned retractively as at It to stifien the flange and form a downwardly and outwardly sloping seat I2 to mount a removable bottom l3 carried as a part of a heater unit assembly M. The heater unit assembly It includes an inner casing having side and end walls 15-48 and ll-IB spaced inwardly of the corresponding walls of the outer casing to form downdraft passages Is for flow of air from the room to be heated downwardly into the casing. The heater assembly also includes a heating unit 20 that is positioned within the inner casing and attached to the bottom l3 by brackets 2i. The bottom I3 is preferably of pan shape in that it has a raised central portion 22 surrounded by a trough-like portion 23. The outer edge of the trough-like portion 23 terminates in an outwardly and downwardly extending flange 24 having a reversely turned lip 25 to stiffen the flange for seating on the seat I2 of the outer casing as shown in Figs. 3, 5 and 6. The lower edges 26 cf the walls of the inner casing are supported in spaced relation from the bottom l3 by legs 21 that may be secured to the corners of the inner casing and which have their lower ends connected with the bottom 13 as by welding or the like. The upper part of the inner casing terminates in inwardly extending portions 28 to provide enlarged inlets 29 for the downdraft passageways l9 and to direct the air heated by the heating unit for flow toward the center of the grill.

The heating unit includes side walls 30 extending parallel with and spaced from the side walls I5 and it of the inner casing and which are connected by end walls 32 and 33 similarly spaced from the end walls of the casing. The side and end walls are closed at the upper and lower ends by a top 3i and a bottom 35. Formed in the top and bottom at one end of the casing 30 are openings 36 and 31 to pass the ends of an updraft tube 38 which provides additional heating surfaces and passageway for air to beheated. The opposite end of the casing has an opening 3!) in the bottom thereof encircled by a flange 40 inset from the underside of the bottom 35. 42 designates a burner pot which includes an annular perforated wall 43 having a lateral flange forming a rim 4|. The burner pot also includes a dished bottom 44 for collecting a pool of oil admitted through an inlet 45 in the side wall thereof. The burner pot has the usual low fire ring 46 however, the high fire ring 41 may be attached as a part of the bottom of the combustion chamber in which case it includes a marginal portion 41' secured to the underside of the inset flange 40 by welding or the like. The flre ring has a depending outer flange 41" for securing the burner pot chamber. The burner pot chamber is formed by an annular wall 48 that is encircled by the flange 41" and which projects throughan opening 49 in the bottom IS. The upper end of the wall 48 is suitably attached to the flange 41" as by welding or the like. The bottom of the burner chamber is closed by a cover 49' having an upwardly extending flange 49" sleeved over the wall of the burner chamber and secured by fastenin devices such as screws 50. The cover or closure has an opening i and the wall-48 is of a length and diameter to provide for air'passage about the burner pot for admitting combustion supporting air. The burner pot is supported with the rim 4| thereof in centered relation with an annular seat 40 of the fire ring by set screws 5| turned in nuts 52 fixed to the inner face of the cover, the heads 53 of the screws being located on the outside of the cover and adapted to be rotated to move the ends of the shanks 56 thereof against the bottom of the burner pot 'as shown in Fig. 5. The fuel is supplied to the inlet of the burner pot through a pipe 55 connected below the furnace bottom with a constant level and control valve 56 of ordinary construction. The constant level control valve, like the burner, requires inspection, adjustment, and repair and in order to remove the valve from below the casing, the trough-like portion in the bottom of the easing preferably has a flat portion 51 formed therein adjacent the burner chamber and which has an opening 58 in the bottom thereof of a size to pass the upper part 59 of the constant level valve. The casing of the constant level valve has a lateral flange 60 overlapping the bottom at the edge of the opening 58 and is adapted to be removably connected by fastening devices such as screws 6| having their heads exposed on th exterior side of the flange so that upon removal thereof the constant level valve is readily withdrawn. The constant level valve has an inlet 62 for the supply of fuel through a pipe 63.

In order that the fuel supply pipe may be removably connected with the valve, the discharge end thereof is connected with a valve through a union nut 64 located below the bottom of the casing. The pipe 63 extends upwardly through an opening 65 in the bottom of the casing and terminates substantially midway of the height of the casing in a lateral bend 66 and which is connected by a union nut 61 with the terminal or a supply pipe 68 normally located within a recess 69 provided on the end wall of the casing. The convalve by slip apart connections. For example, the rod 10 has a hook 10' on the end thereof that slips into an opening in the reset lever and the rod H is also detachably connected with a flow adjusting valve.

The heater unit has a flue outlet connection or collar 15 registering with a flue pipe connection collar 16 carried by the end wall of the casing.

Slidable in the flue connection collar is a telescoping pipe section or thimble 11 adapted to engage over the collar 15 to form a continuous duct from the combustion chamber of the heating unit with the flue pipe.

The thimble 11 is latched in position by a latch arm 18 pivoted to the collar 15 by a screw or the like 79. The free end of the latch has a notch adapted to engage a pin 8| carried on the telescoping section. The latch is provided with a finger grip 82 whereby it may be moved into and out of latching position.

In installing a floor furnace constructed as described, an opening 1 is made in the floor and the casing 2 suspended therein with the flanges 9 supported on the floor 8 at the marginal edge of the opening. The fuel supply pipe 68 is connected with the casing and the flue connection collar 16 is connected with a chimney, or other suitable vent. The telescoping section or thimble H is slid within the flue connection collar so that the heater unit assembly including the inner casing and the bottom l3 are movable through the open top of the casing with the bottom l3 passing the fuel supply pipe and the retracted thimble 11 to seat upon the flange seat l2 of the casing walls. After placement of the assembly, the' union 6'! is connected with the bend 66 of the pipe 63 that leads to the constant level and control valve 56. The telescoping flue connection or thimble TI is then shifted to engage over the collar 15 after which the latch 18 is swung into position so that the notch 80 thereof engages the pin 8|. The grill (not shown) is then placed over the top of the furnace completing the assembly.

After the furnace has been in operation for some time, the burner 42 and constant level con: trol valve 56 usually require inspection and servicing. When the furnace has been installed in a home without a basement, the entire assembly including the bottom I3 of the casing which carries the burner 42 and the constant level control valve 56 is readily removed upwardly through the open top of the casing so that any part of the assembly may be worked on at a position above the floor. This is effected by a disconnecting the union nut 61' and by disengaging the latch 18 and pushing the telescoping connection or thimble 11 into the. flue connection collar I6 so that the underlying bottom of the casing will clear the end thereof when the unit is lifted through the top of the casing.

When the unit is removed and placed above the floor, the parts thereof are readily removed for inspection and repair. When the heater assembly has been removed from the top, it is readily lowered through the open top of the casing until the flange on the bottom seats. upon the inturned flange of the casing wall, after which, the flue and fuel pipe connections are reestablished.

When the furnace is installed in a home having a basement. it is more desirable to service the furnace from the basement side. The burner may be readily serviced by disconnecting pipe 55 and removing the screws 60 so that the cover 49' and burner pot 42 will drop from position within the burner chamber. The constant level valve 56 is readily removed by disconnecting the union nut 64 and removing the screws 6|. The slip apart connections with the rods are readily disengaged and the constant level valveis free to be serviced. After servicing, the burner pot 42 is moved through the lower end of the burner chamber followed by the cover 49'. The flange 49" of the'cover is pushed into position-so that it telescopes the burner chamber, after which the screws 50 are inserted. The burner may be tightened in its seat by adjusting the set screws The constant level valve 56- is returned to position by moving the upper part-59 thereof through the opening 58 until the flange 60 engages its seat. The connections for the rods and H are made and the screws 6| are inserted. The pipe 55 which has been disconnected is then reconnected to establish fiow between the constant level valve and the burner pot.

The form of invention shown in Fig. 6 is substantially the same as that above described except that the constant level and control valve 56 is mounted entirely below the bottom l3 on a braclget 83 carried by the side wall 48 of the 7 burner pot chamber.

From the foregoing it is obvious that I have provided a floor furnace construction'which may be installed and serviced from above or below the floor. Thus, the furnace is adapted for any installation either in homes with basements or without as the case may be. I

What I claim and desire to secureby Letters Patent is:

1. A floor furnace including a casing having walls adapted to be suspended within a floor opening and having an open top-normally adapted to be covered by a grill, a bottom for the casing, means for removably supporting said bottom by said walls, a heater unit assembly carried by the bottom, means connecting the heater unit with said bottom for removal of said bottom with the heater unit through the open top of the casing, said heater unit including a constant level control valve, and means for removably mounting said valve on said bottom for removal with the heater unit assembly through the top of the casing and for separate removal downwardly from said bottom exteriorly of the casing when the heater unit is in position within the casing.

2. A floor furnace including a casing having walls adapted to be suspended within a floor opening and having an open top normally adapted to be covered by a grill, a bottom for the casing provided with an opening, means for removably supporting said bottom from'said walls, a heater unit carried by the bottom means connecting the heater unit with said bottom for removal of said bottom of the heater unit through the open top of the casing, said heater unit including a burner pot, means supporting the burner pot for downward removal exteriorly of the casing through the opening in said bottom when the heater unit is in position in said casing, and a constant level control valve carried by said bottom when the heater unit is removed for removal downwardly with said bottom through the top of the casing.

3. A floor furnace including a casing having Walls forming an open top and open bottom adapted to be suspended within a floor opening,

a removable bottom for the casing having an opening, means carriedby the casing walls providing a support for said bottom, an annular wall 6 sides of a burner pot chamber. a bottom closure for the burner pot chamber, means removably connecting the bottom closure with'the annular wall of said chamber, a heating unit carried by the removable bottom of the casing and having a combustion chamber provided with a circumferential seat substantially coaxlally registering with the wall of the burner pot chamber, and a burner pot in the burner pot chamber having a rim engageable with said seat,

4. A floor furnace including acasing having vwalls forming an open top and open bottom adapted to be suspended within a floor opening, a removable bottom for the casing having an opening means carried by the casing walls providing a support for said bottom, an annular wall extending through said opening for forming the sides of a burner pot chamber, a bottom closure for the burner pot chamber, means removably connecting the bottom closure with the wall of said chamber, a heating unit carried by the removable bottom of the casing and having a combustion chamber provided with a circumferential seat substantially coaxially registering with the wall of the burner pot chamber, a burner pot in the burner pot chamber having a rim engageable with said seat, and means carried by the bottom closure for supporting the burner pot in engagement with said seat.

5. A floor furnace including a casing having walls forming an open top and adapted to be suspended within a floor opening, a removable bottom for the casing, means carried by the said walls providing a support for said bottom, a burner pot housing having its side walls projecting downwardly fromsaid bottom and a bottom closure, means removably connecting the bottom pot housing, a burner pot having a rim engage-a, able with said seat, means carried by the re-'- movable closure for supporting the burner pot in engagement with said seat; a constant level con trol valve, means supporting-the control valve for removal on said bottom, and a detachable fuel conduit between the constant level control valve and the burner pot and located below said bottom.

6. A floor furnace including a casing having Walls forming an open top and adapted to be suspended within a floor opening, a removable bottom for the casing, means carried by the said walls providing a support for said bottom, said bottom having an opening, a burner pot housing having an annular wall in contact with the periphery of said opening and a bottom closure means removably connecting the bottom closure with said wall of the housing, a heating unit having a combustion chamber carried by the removable bottom of the casing and having a circumferential seat substantially registering with the wall of the burner pot housing a burner pot having a rim engageable with said seat, means carried by the removable closure for supporting extending through said opening for forming the 7 supply pipe outset from the path of movement of removably supporting the burner pot from said bottom exteriorly of the casing when the bottom is in said casing.

8. A furnace of the character described including, an outer casing having a bottom, means providing removable support for said bottom, a unit assembly removable from the outer casing and including an inner casing, a heating unit within the inner casing and supported by said bottom, a constant level fuel control valve for supplying fuel to.

the heating unit, means for mounting said constant level valve for removal from below said bottom, operating rods for said constant level valve supported by the inner casing, and slip-apart connections between the constant level valve and said rods for effecting disconnection of said rods when the constant level valve is removed from below said bottom.

9. In a floor furnace including a casing having side walls forming an open top and adapted to be suspended within a floor opening, a removable assembly in said casing including a casing bottom and a heating unit carried on and fixed to said bottom, means on the side walls providing removable support for said bottom, a flue connection collar having one end fixed to one wall of the casing in substantially flush relation with 'the inner face of said wall, a collar on the heating unit, a thimble connecting said collars and slidable into one of the collars for clearance in passing said bottom by the wall-supported collar when the assembly is removed through the open top of the casing, a fuel supply duct extending through.

a wall of the casing and having connection with the heating unit, and a coupling in the supply duct on the inside of the casing and offset outwardly from the path of removal for said bottom.

10. In a floor furnace including a casing having side walls forming an open top and adapted to be suspended within a floor opening, a removable assembly in said casing including a casing bottom and a heating unit carried on and fixed to said bottom, means providing removable support for said bottom, a flue connection collar having one end fixed to one wall of the casing in substantially flush relation-with the inner face of said wall, a collar on the heating unit, a thimble connecting said collars and slidable into one of the collars for clearance in passing said bottom by the wall-supported collar when the assembly is removed through the open top of the casing, a constant level valve for said heating unit and removably carried by said bottom of the casing below said bottom, a fuel supply duct extending through a wall of the casing and having connection with the constant level valve below said bottom, and a coupling in the fuel supply duct on the inside of the casing and offset outwardly from the path of removal of said bottom to pass the bottom when the heating unit is removed from the casing.

11. A floor furnace including a casing having walls forming an open top and adapted to be suspended within a floor opening, aremovable bottom for the casing, means carried by said walls providing support for said bottom, said bottom having an opening, an annular wall extending through said opening to form sides of a burner pot chamber, a bottom closure for the burner pot chamber, means removably connecting the bottom closure with the annular wall, a heating unit carried by and connected with the removable bottom of the casing and having a combustion chamber provided with a circumferential seat substantially registering with the annular wall of the burner pot chamber, a burner pot in said chamber and having a rim engageable with said seat, and set screws carried by the removable closure and engaging the bottom of the burner pot for supporting the burner pot in engagement with said seat.

12. A floor furnace including a casing having side walls forming an open top and adapted to be suspended within the floor opening, a removable bottom for the casing, means on the side walls supporting said bottom, an annular wall extending through said bottom and depending below said bottom to provide the sides of a burner pot chamber, a bottom closure for the burner pot chamber, means removably connecting the bottom closure with the annular wall of said burner pot chamber, a heating unit having a combustion chamber provided with a circumferential burner pot seat substantially registering with the wall of the burner pot chamber, a burner pot in said burner pot chamber having a rim engageable with said seal; and removable from said chamber when the bottom closure is removed, and adjustable means carried by the bottom closure for urging the burner pot into engagement with said seat.

13. A floor furnace including a casing adapted to be suspended within a floor opening and having an open top normally adapted to be covered by a grill, a removable bottom for the casing adapted to pass through said open top of the casing, means supporting the bottom for removal through said open top of the casing, a heater unit connected'to and carried by the bottom for removal with said bottom through the open top of the casing, a fuel supply duct extending through a wall of the casing and having connection with the heater unit, and a coupling in the supply duct ,on the inside of said casing and offset outwardly from the path of removal of said bottom to pass said bottom when the heater unit and bottom are removed from the casing.

SHIRLEY POLLARD CAMPBELL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 340,826 Sears Apr. 27, 1886 1,591,889 Schmitt July 6, 1926 2,073,270 Valjean Mar. 9, 1937 2,200,645 Stephens May 14, 1940 2,263,737 Miller et al Nov. 25, 1941 2,392,541 Martin Jan. 8, 1946 

